(;GM[1]FF[4]AP[Drago:4.22.03]SZ[19]CA[UTF-8]PB[Black to play and live]AB[qr][rq][rp][qp][pp][op][np][mq][mr]AW[pr][qq][pq][nq][nr][mp][lq][kr][lp][no][oo][po][qo][ro]
(;B[sr]C[This threatens to make two eyes.];W[rs];B[qs]
;W[sp]C[Black has only one eye so needs to capture something];B[ns];W[or];B[os];W[lr];B[ms]
;W[ls]C[Black runs out of liberties.])
(;B[ps]C[So can Black capture first to make the eyes?];W[rr];B[or];W[qs];B[oq];W[os];B[ns]
;W[sr]C[White is almost alive and Black has to fight a ko.])
(;B[qs]C[This is the correct first play.]
(;W[lr]
;B[sr]C[If White removes the aji of the two stones then Black lives.])
(;W[sp]C[This stops two eyes in the corner.];B[ps]C[White is short of liberties.];W[or];B[ns];W[lr];B[ms];W[ls]
;B[os]C[The white stones run out of liberties.])))
